Question

A man gets a job with a salary of $40,000 a year. He is promised a $1900 raise each subsequent year. Find his total earnings for a 10-year period.

I got 59,000 and it is wrong what it the correct answer?

Answer 1

This is an arithmetic series where
a = 40000 , d=1900
you want sum(10)
sum(10) = (10/2)(2(40000) + 9(1900))
= 485500

What you found is how much he made in the 11th year.